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Table 5 Two-piecewise regression analysis of the effect of dietary fibre intake on the progression of attachment loss in males and females

From: Association of vitamin K, fibre intake and progression of periodontal attachment loss in American adults

Attachment loss progression

Males

β (95% CI), P value

Females

β (95% CI), P value

Fitting by the standard linear model

-0.0012 (-0.0018, -0.0007) < 0.0001

-0.0008 (-0.0014, -0.0002) 0.0086

Fitting by the two-piecewise linear model

 Inflection point

967.5 mg

18.05 mg

 Dietary fibre < Inflection point

-0.0018 (-0.0024, -0.0011) < 0.0001

-0.1180 (-0.1743, -0.0618) < 0.0001

 Dietary fibre > Inflection point

0.0022 (-0.0003, 0.0047) 0.0863

-0.0002 (-0.0008, 0.0005) 0.6687

 Log likelihood ratio

0.006

 < 0.001